This is a pdf compilation of three vintage hog-raising booklets. "Hogology," pictured above, from 1907, is just one of the books in this package. "The Hog Supreme: Poland China" (1914) and "Connecticut and the Hog" (1922) is also in this pdf download.
It amounts to 150+ pages of great historical perspective on raising hogs. . Click the word "homepage" in orange above to learn much more about this resource.